Topic: hyvo chain conversion

[Bill/BentON Racing]

I can test it! Lol,Bill

[kmb69]

Did you look at that gear driven Dohc Keith.... me likey....

Yes, me likey too. I have already been in discussion with Brent for a while now.     

[tony sawyer]

i reckon will try for next season at the moment I've just coverted two drives with new rubbers had a set from germany and trying the french guys also tried to contact m3 racing without any success .
had our first rubber failiar last year
that seams to be the case with chain stretch as the cush drive collapsed on one side
going to have a look at dohc tensioner.
if you can help with the chain info maybe where to find the best rubbers it would be much appreciated
regards tony

[kmb69]

Don't waste your time with the overpriced M3 JUNK.

Bear (Brian) should be able to help with the best rubber, especially if you are "Down Under".

[Retro Rocket]

Did you look at that gear driven Dohc Keith.... me likey....

Yes, me likey too. I have already been in discussion with Brent for a while now.     

Keep me in the loop Keith, I'm still silly enough to want/buy one....

Sorry for the hijack Tony but you won't get this kind of information anywhere else mate...

[bear]

Tony,

If your going to persevere with the stock setup for the time being I suggest you weld up the cush drive sprockets.

Keith's right, don't bother with the M3 rubbers their junk.

I will chase up the Morse chain specs for you over the weekend

Have a close look at the dogs on 2nd & 3rd gears before you button it up.

They are usually the next failure down the line if your cush drive has been hitting the bump stops.

The stop pins on the cush drive are worth look at as well.

Cheers,
Brian

[Ilja]

For those of you that have fitted the Hy-Vo cranks in order to handle increased loads.  I'm well aware that the following is all about the DOHC engine but what I'm showing you contains lessons that can be applied to the SOHC.
 Here is my Gear drive conversion for the 900-1100 DOHC engine and has proven to be an effective and viable solution to eliminating the primary chain failure.  In addition it has shown a reduction in parasitic losses and oil temps dropped with this conversion fitted. Without question it has proved to be a major advance over anything else in this area.
 The story behind this is that we have progressively developed the DOHC engine to a point that we can no longer keep the primary chain in them when road racing.  Our engine now exceeds 180 RWHP and operates between 11500 -12000 RPM and during sustained operation the chain would fail and this Gear Drive development solved the problem.

 Brent
https://www.facebook.com/100004676028806/videos/551798074986055/
 
https://www.facebook.com/100004676028806/videos/551773721655157/
 

Jesus christ the work that has been done to this DOHC... amazing, very nice! It sounds fantastic with the skinny crank.

Though I'm surprised the main hy-vo chain gave such issues. I have a gpz turbo also with identical style primary hy-vo chain and people have been pushing 275hp with those engines with huge torque numpers. Mine's at 190hp at 21psi. 
The engines go from 100 to 200 hp from 5500 to 6500 rpm so are getting quite a bit of load also.
No one has ever reported issues with the primary chain as far as I know. But then again those bikes aren't raced for extended periods, only some top speed runs and a lot of drag racing. The output bearing fails sometimes as the engine cases are being pushed apart and the bearing starts to spin in it's seat. More or less the only weakness.


The part about the dampers and chains failing of the SOHC engine got me wondering... how do you notice if the dampers are out?
My sohc turbo bike also is pushing quite a bit of HP and already had 72000km on its bottom end pre-turbo.. and I'm hearing a lot of clacking and rattling down there, especially when clutching.

[Retro Rocket]

For those of you that have fitted the Hy-Vo cranks in order to handle increased loads.  I'm well aware that the following is all about the DOHC engine but what I'm showing you contains lessons that can be applied to the SOHC.
 Here is my Gear drive conversion for the 900-1100 DOHC engine and has proven to be an effective and viable solution to eliminating the primary chain failure.  In addition it has shown a reduction in parasitic losses and oil temps dropped with this conversion fitted. Without question it has proved to be a major advance over anything else in this area.
 The story behind this is that we have progressively developed the DOHC engine to a point that we can no longer keep the primary chain in them when road racing.  Our engine now exceeds 180 RWHP and operates between 11500 -12000 RPM and during sustained operation the chain would fail and this Gear Drive development solved the problem.

 Brent
https://www.facebook.com/100004676028806/videos/551798074986055/
 
https://www.facebook.com/100004676028806/videos/551773721655157/
 

Jesus christ the work that has been done to this DOHC... amazing, very nice! It sounds fantastic with the skinny crank.

Though I'm surprised the main hy-vo chain gave such issues. I have a gpz turbo also with identical style primary hy-vo chain and people have been pushing 275hp with those engines with huge torque numpers. Mine's at 190hp at 21psi. 
The engines go from 100 to 200 hp from 5500 to 6500 rpm so are getting quite a bit of load also.
No one has ever reported issues with the primary chain as far as I know. But then again those bikes aren't raced for extended periods, only some top speed runs and a lot of drag racing. The output bearing fails sometimes as the engine cases are being pushed apart and the bearing starts to spin in it's seat. More or less the only weakness.


The part about the dampers and chains failing of the SOHC engine got me wondering... how do you notice if the dampers are out?
My sohc turbo bike also is pushing quite a bit of HP and already had 72000km on its bottom end pre-turbo.. and I'm hearing a lot of clacking and rattling down there, especially when clutching.

Circuit racing is far harder on the drive, thousands of gear changes under full load compared to just a few soon takes its toll....